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How to calculate water molecule in water

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This is very simple calcuation.

We have 200 ml of water. How many molecule are here?


Assumption
Water has 1 g/cm2 of density
Avogadro constant = 6.022*10^23
Molecule of water = 18

Answer)

200 ml = 200 g
200 / 18 = 11.11 mol
11.11 * 6.022*10^23 = 67 * 10^23

Easy!!

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